Links from e to:

Termini Station:
Express 90 (15min), 36 e 84 (20 min.)

Center (piazza Venezia):
Express 60, night 60 (20 min.)

Tiburtina Station:
211 (20 min)

Fiumicino Airport:
FM 1 Train (50 min.) till Nomentana Station
Leonardo Express Train till Termini Station.

Book and buy the train ticket.